Production of UHMWPE sheet materials
AssigneeQuadrant Epp AG
InventorsJoseph V. Gregg, Wesley Allen Kohler
Life of this patent
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Abstract
UHMWPE panels of large width may be prepared by a continuous ram extrusion process by employing a slit die which preferably narrows from both sides in a direction transverse to the machine direction, and/or which employs a plurality of transversely positioned cooling zones located on the top and the bottom of the die, proximate the exit thereof. The panel exits the die at a temperature lower than the crystalline melt temperature.
Claims23
A ram extruded UHMWPE panel having a width of 0.6 m or greater, a thickness variation of less than 1.27 mm (3σ), and smooth, glossy top and bottom surfaces, both top and bottom surfaces having a plurality of substantially parallel, visually observable shot marks with an average height of about 70 μm or less.
Dependencies are inferred from the claim text.